Thus the branchial and pharyngeal arches are accounted part of the splanchnoskeleton, as belonging to the same category as the heart bone of some ruminants, and the ossicles of the stomach in the lobster (p.
Meckel's Cartilage and Ear-ossicles in Embryo of Pig.
We may compare the similar thought that the ear ossicles are simply opercular bones reduced and turned to other uses.
His brilliant work on the development of the ear-ossicles founded what we may justly call the classical theory of their homologies.
He did not, however, himself realise the relation of the ear-ossicles to the gill-arches, though he knew that Spix and Geoffroy were quite wrong in homologising them with the opercular bones in fish.
The ossicles of the ear in mammals are "peculiar mammalian productions in relation to the exalted functions of a special organ of sense" (p.
These ossicles are known as the malleus and incus, and the chain of the three ossicles replaces physiologically the single ossicle of the lower forms.
The general plan of structure of the auditory ossicles in Baiomys resembles that in Calomys, Akodon, and Thaptomys.
The conformation of the ossicles of both Onychomys and Oryzomys appears to be more nearly like that in Peromyscus than that of Baiomys.
Examination of a number of auditory ossicles of Baiomys reveals constant interspecific differences in the malleus and incus.
In Zygodontomys, size and shape of the ossicles differ greatly from those of Baiomys.
The ossiclesof Calomys and Thaptomys, in particular, closely resemble the auditory ossicles of Baiomys musculus.
The lowest Marsupials as regards the ossicles are the Peramelidae, whose ossicles are of a frail papery consistence.
In some Odontoceti vestiges of dermal ossicleshave been described, and in Zeuglodon the back was probably protected by dermal plates.
In Phocaena phocaenoides the occurrence of vestigial dermal ossicles has been described, and in Zeuglodon the back was probably protected by dermal plates.
The brachial ossicles represent the reduced and modified radiale and basalia of cartilaginous fish such as the dogfish.
In the Pinnipedia the auditory ossicles have a very dense consistence, and except in the Otariidae are very large.
The ossicles are homologous as a whole to the hyomandibular of fishes and to the columellar chain of Sauropsids and Amphibians.
The columella and stapes are together homologous with the mammalian auditory ossicles and with the hyomandibular of Elasmobranchs.
The structure is as a whole homologous with the auditory ossicles of mammals and the hyomandibular of fish.
The above is the arrangement of the auditory ossicles met with in the higher Mammalia, but in the lower Mammalia the characters approach more nearly to those met with in Sauropsids.
It is the same with the lowest amphibia, but in the higher amphibia they undergo various modifications; and in the three higher classes of Vertebrates (including man) the hyoid bone and the ossicles of the ear develop from them.
A little bone; as, the auditory ossicles in the tympanum of the ear.
Defn: One of the central ossicles in each joint of the arms of an ophiuran.
Next to the ambulacra; as, the adambulacral ossicles of the starfish.
The five united jaws and accessory ossicles of certain sea urchins.
Preservation of the ossicles and tympanic membrane after performing the complete mastoid operation.
Stacke’s operation was devised with a view to removal of the ossicles and outer wall of the attic in those cases in which the bone disease was limited to these regions.
If the disease be limited to the ossicles themselves and to the anterior and outer part of the attic, a favourable prognosis may be given.
Weber, in his day, regarded the ossicles which unite the air-bladder of fishes with the labyrinth as organs expressly designed for conducting sound from the former to the latter.
But besides the auditive function, Weber's ossicles may perfectly well discharge some other function.
The resemblance of the flooring-plates to the ambulacral ossicles of a starfish is so exact that one can explain it only by supposing similar relations of the water-canals and their branches (podia).
Note at the tip of each arm or ray a cluster of small calcareous ossicles and within each cluster a small speck of red pigment, the eye-spot or ocellus.
Note that some of the ossicles support certain very small pincer-like processes, the pedicellariae.
The ossicles on the margins are large; some of them are hemispherical and bear large spines.
The body is flat and smooth; the rays sharply pointed and conspicuously bordered with marginal ossicles and fringed with short spines; two rows of ambulacral feet; color rich purple.
Numerous otherossicles extend over the surface, buried in the integument of the body, making a calcareous network, or /exoskeleton/.
The ossicles are of various sizes and shapes, and are one of the determining features in classification.
The ossicles are covered with /spines/ of two kinds.
The ossicles are connected by muscles so that the animal is not rigid, but is able to bend the body and even creep through comparatively small places.
If the pyloric caeca be laid back, one can see the rib-like arrangement of the ambulacral ossicles, and also the ampullae, which lie between the ossicles on each side of the ridge.
The external auditory organ has become confluent with the branchial aperture, and the auditory ossicles have become parts of the branchial operculum.
The auditory ossicles are the limbs subtilized or refined in character.
The auditory ossicles are indeed members which have originated from branchiæ.
In Fishes, the auditory ossicleshave degenerated into the branchial opercula.
Probably the antennæ are the auditory ossicles themselves which have emerged outwards, as in the Fishes and Reptiles.
With the exception of a few instances, the ears first become apparent in Fishes, being in them at least furnished for the first time with true ossicles and semicircular canals.
The external auditory meatus is notwithstanding usually covered by integument, the auditory ossicles are mostly blended into one, which projects above the skull; the cochlea is wanting.
The innermost of the ossicles of the ear; the stirrup, or stirrup bone; -- so called from its form.
The similarity in the morphology of these ossicles indicates a close relationship between all three genera.
The auditory ossicles are of three types which differ only slightly.
Lateral views of the left ear ossicles (articulated) of the Recent genera of the subfamily Zapodinae.
These ossicles possibly are more conservative than some other structures because the ossicles are not so much affected by the molding influence of the environment.
In certain Teleostean fishes the swim bladder forms a secondary communication with the internal ear by means of special ossicles (see G.
It is ciliated except where it covers the membrana tympani, ossicles and promontory; here it is stratified.
The ossicles are avoided by selecting a posterior portion of the membrane.
The largest ossicles are oblong in shape when viewed from within, and measure approximately 0.
Moreno may be correct in referring the problematical specimen to Mylodon; or the dermal ossicles of this extinct genus may have been uniform throughout, only differing in size and sparseness or compactness--in which case Dr.
In a section of the skin provisionally ascribed to the leg, he observes that the small ossicles are very irregular, and shows two instances in which two are placed one above the other.
The auditory ossicles of Grypotherium, therefore, are very different from those of Myrmecophaga, in which the malleus is less sharply bent, the incus has divergent arms of unequal length, and the stapes exhibits a large perforation.
In microscopical structure the dermal ossicles are of much interest, and I have examined both horizontal and vertical sections, one of the former kindly prepared by Prof.
It is also to be observed that, where the inner surface of the skin is intact, the ossicles are completely embedded and only faintly visible through the dry tissue.
The auditory ossicles were preserved in the tympanic cavities of both skulls, Nos.
Comparing these ossicles with the fine collection in the Royal College of Surgeons, they prove to be closely similar to those of all the existing Sloths, but most nearly resembling those of Choloepus didactylus.
In some parts of the skin the ossicles are exposed on their outer face; but appearances render it almost certain that this exposure is due to the disintegration and abrasion of the specimen.
Meanwhile it must suffice to compare the microscopical structure of the ossicles from the new skin with that of the small sculptured tubercles of undoubted Mylodon.
Another interesting feature of the new piece of skin consists in the dwindling and even total absence of the ossicles towards the ventral border.
The long axes of the elongated ossicles are nearly always coincident with the direction of these rows.
The original situation of the piece of skin being thus determined, it is interesting to observe the disposition of the ossicles in the lower layer.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ossicles" in a variety of sentences. We hope that you will now be able to make sentences using this word.
